Clamp



S. R. GILMORE.

CLAMP.

APPLICATION FILED MAY 23. 1921.

1 ,4 1.1 ,0 1 3 a nt d Mar. 28, 1922,

I! j J Q) J A Q 7 1M 3 I i I J) '9 .20 Q) 6 I) K? E v (U 2 5 1 16 I l 2 INVENTOR. 16 Samuel 6. fia ure 1 TTOR NEYS- vview through one of the clamping members,

I face with a boss 2. Extending ,boss 2 and the body 1 is a threaded opening SAMUEL R. GIIJllIORlil, OF SEATTLE, WASHINGTON.

CLAMP;

Application filed May 23, 1921. I Serial No. 471,727.

To alt whom it may concern:

Be it known that I, SAMUEL R. Gimronn, a citizen of the United States, residing at Seattle, in the county of King and State of VVashin ton, have invented certain new and useful I mprovements in Clamps; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to new and useful improvements in clamps, andmore particularly to that form of clamp having two opposed jaws provided with operating means to move the aws toward and away from each other, the main object of the present invention being the provision of a simple and easily operated clamp provided with jaws of such construction that they may be readily used for clamping an object between the jaws or inserting the jaws between two objects to be separated and is so simple in its construction that it can be easily carried from place to place and furnish greater binding power than is ordinarily obtained from any portable clamp in use.

Another object of the present invention is the provision of a clamping member comprising two opposed jaws having operable means for moving the jaws toward and away from each other and provided with frictional bearings at the points where the greatest strain 1s produced in order to eliminate the a friction at these points.

With the above and other objects in view the invention consists in the novel features of construction combination and arrange ment of parts hereinafter more fully set forth, pointed out in the claim and shown in the accompanying drawings in which:

Figure 1 is a side "elevation of a clamp constructed in accordance with my invention;

Fig. 2 is a detail longitudinal sectional parts being illustrated in elevation.

In carrying out my invention, I provide a movable clamping jaw generally indicated by the numeral 1 and provided upon its outer through the adapted to receive a screw member 3,said screw member having a head portion 4 at its outer end and provided with a trans verse opening 5.

between the inner face Thebody l of the movable clamping jaw is provided at one end with an angular exof the screw-3 adjacent'thehead 10 :is pro- 1 vided with a smooth surface as indicated at 11, the smooth portion being disposed with in a transverse op'enin 12 formed in the head 8 and communicatlng with the recess 9.

In order to prevent friction between the inner wall of the recess 9 and the head 10 of the screw, opposed raceways 13 are formed in the wall of the recess and the head lOadapted to receive the bearing balls 14 which are circumferentially arranged around the head member 2 and disposed between the head member and the inner wall of the recess 9.

The recess 9 is closed by 'means of a cover plate 15 secured in position by means of the bolt 16. The head 10 of the screw and the inner face of the plate 15 are each provided with a raceway arranged in opposed relation for the receptionof a bearing 17 which is adapted to eliminate friction of the plate 15 and the outer face of the head 10 when the screw 3 is turned.

The head 8 is provided with a transverse opening 18 at right angles to the head 8 and disposed parallel with the opening 12 forthe reception ofthe inner end of the arm 6 whereby the arm 6 may readily move through the head portion 8 when the jaw 1 is moved toward the jaw 7. A chamber 19 I is formed within the head 8 in alignment with the opening 18 and arranged within this chamber are the bearing balls 20 adapted tobe disposed between the arm 6 and the wall of the chamber to reduce the friction,"

said balls being retained within the chamhere by means of thecover plate 21 secured in position by the screw bolts 22.

Any suitable power may be used and applied to the head portion 4: for rotating the screw member 3, said screw being rotated in the desired direction to move the jaw 1 toward or away from the jaw 7 when clamping an object between the two jaws or separating object bfll ween which the jaws may l. The main clamping STATES PATENT OFFICE.

i be arranged. It be noted that afterthe jaws engage an object to be clamped therebetween,

the arm 6 and the walls of'the chambers 19. When the two jaws are placed between objects to be; separated, the strain of the screw member 3 will be brought against the bearingball l7, which willeliminate friction between the head 10 and the inner face ofthe plate 15. In the construction of my improved clamp, the. jaws l and? and arm 6 may :be constructed of any suitable material in accordance with ,the use towhich the clampis to be put.

A device of thesclass described including further rotati'ofioffthe screw 2 will tend to exert pressure upon the ball bearingsQO and 14; which will eliminate the friction between the head member 10 and the 'inner'wall'of the-recess 9 andbetw'eena jaw having a head portion atone end proided withspaced transverse openings, said head portion being also provided with a .recess communicating with one of said openings,fa screw member extending through one of said o'penings and having its head portlon arranged wlthin the recess, a removable plate attached to the head and closing therece ss, bearing balls arranged between the head of the screw, the inner wall of the recess and the plate, arm on the second jaw extending through one ofthe openings provided with a threaded opening to receive the screw member whereby the. 13.;WS can bermoved toward and away from each other.-

In testimony whereof I affix my signature.

SAMUEL R. GILMORE.

a second jaw a, guide in thehead of said first mentioned yaw and said second jaw being" 

